﻿using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApp2
{
   public class Dbhelper
    {

        private static readonly string conString = "server=.;database=Schools;uid=sa;pwd=123456;";

        public static DataTable GetDataTable(string sql)
        {

            //连接数据库

            SqlConnection connection = new SqlConnection(conString);

            SqlDataAdapter adapter = new SqlDataAdapter(sql, connection);

            connection.Open();

            DataTable dt = new DataTable();

            adapter.Fill(dt);

            //返回数值
            return dt;

        }

        public static int AddOrUpdate(string sql)
        {
            SqlConnection connection = new SqlConnection(conString);

            SqlCommand command = new SqlCommand(sql, connection);

            connection.Open();

            return command.ExecuteNonQuery();
        }

    }

}
